This has never made sense to me. If I put a drop or two of washing-up liquid (“Dish Detergent” in US English) in a plastic food container with water, and snap on the lid, then shake the container, the lid will try to pop off on its own. Or if I do it in a screw-top container like a bottle or a jar, when I go to unscrew the lid it will act like a carbonated beverage (pop!). Why?
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